Safety water-gage for steam-boilers



H. A. RENNICK. SAFETY WATER GAGE FOR STEAM BOILERS.

AFjPLICATlON FIL ED FEB.1Z, 1920- 1,377,436.

2 SHEETS-SHEET 1.

Patented May 10, 1921 H. A. RENNICK. SAFETY WATER GAGE FOR STEAM BOILERS.

APPLICATION FILED. FEB. 12, 19201 V Patented May 10,1921. 2 SHEETS SHEET 2- wwwwo HENRY AUGUST anmxiiox, or o'r'rAwiholvrAnro, CANADA; 1

sArnrY WATER-GAGE Fort STEAM-so tens :T all'whom it may concern: j I

Be it known that I, HENRY AUGUST REN- NICK, a citizen of Canada,"residing at Ottawa, in the county ofCarleton and Province of Ontario, Canada,"have invented certain new and useful Improvements in Safety Water-Gages for-Steam-Boilers; and I do -declare the following to be a'full, clear, and

exact description of the invention, such as will enableothers skilled in the art to which 1 it appertains to make and use the same, reference being had to the accompanying draw-' ings, and to the letters and figures of refer-' ence marked thereon, which form a part of 1 this specification. A i. l

My invention relates to a safety water gage for steam boilers and especially to glass gage mountings wherein a valve is a closed automatically on the breaking of the glass. 7 I V The object of the invention is to con-,

\ struct a valve which aside from being automatic in its closing action, may be actuated by hand.

.In the drawings, wherein similar nu-.

merals of reference refer to similar parts throughout the different-views: I

Figure 1 is a view of the gage as applied to a boiler.

Fig. 2 is a section ofthe mounting on line can, of Fig. 1.

1 Fig.3 is a section on line 0, 0, of Fig. 2.

Fig. .4 is a cross section of theibushing for connecting a try-cock.

Referring to Fig.1, 1 is the shell of the lower glass mounting and 2 is the shell of the upper glass mounting. Asboth mountings are of similar construction and as they are interchangeable, one only will be described. 1

Referring-to Fig. 2, 3 is a'fragment of a boiler plate, 4:,is an extension of the glass mounting having screw threads 5 screwed in the threaded opening in the boiler plate.

The extension-,4 is integral with the shell 1 of the mounting, said shell has an opening 6 closed" by a plug 7, another opening 8 closed by a plug. 9. The. opening 6 is intended to permit the machining of the valve seat, to grind said valve on said seat and also to insert the valvein place. v

The opening 8 servesto clean the steam passage in the extension 4. i

The valve 10 is provided with a. stem 11 glass in position.

,which carries spiral'threads 12 and a liandle 13 secured in: place by nut 14 asshow n.

The shell 1 is formed with a longitudinally threaded bore16 to receive the threads 12 ofthe stemll. Valve 10 is shown asfastened on thestein' 11 by nut 17. The outer end .of the valve stem is made: steam-tight 5 by packing 18 held in place by cap 19.

box intended to receive a bushing 24 to ,which may. beconnected a blow off valve 25, or this opening may beclosed by aplug 26. The, upper" aperture 23 0f the upper mountlng mayyserve to insert the gage The mode of operation is as follows:

.When the glass is fractured the onrush valve toward its seat and owing to the screw thread in its stem, this stem will revolve until the valve is seated. It will be clear that a reverse. movement can be given to the valve by actuating the stemby hand with a handle 13. It will therefore clear that a as soon as the broken glass has been re- I placed a turn of the stem by handle 13 will unseat the valve and place the gage in working condition.

I claim: j 1. A gage glass mounting having a valve chamber provided'with steam inlet and. outletextensions', a coarse pitch female thread formedin the bore. of said outlet extension,

' Specification of Letters Patent. Paf nte d B 1 3 1Q, 1921:; f Lpplication filed. February .12, 1920. SerialNo. 358,225. I i l of the steam toward the break, presses the a valve Inountedin said chamber to close the steam outlet by the rush of steam uponthe breakage of the glass, said valve having a threaded stem engaging thethreads in the "outlet extension, the pitch of the threads being sufficiently coarse to-permit the pressure of steam to screw thevalve stem and thereby close the valve upon. its seat.

2. .A gage glass mounting having a valve chamber communicating with the steam under-(pressure, a valve seat at [one end of said chamber, an fextensionof said chamber contiguous with said valve seat and formed with a longitudinal bore carrying acoarse pitch female thread,a valve stem provided with a threadto engage the thread in the said extension, the itch r the v I 2 I i V ,3 7, I j

\ stem and thereby close the Valve upon its seat upon the breakage of the glass, at Valve 7 threads being sufliciently coarse to-permit lntestimony whereof Iaflixmy signature the pressure of steam to screw the valve in presence of two witnesses. V r HENRY AUGUST RENNICK.

rigidly Connected" to said stem, said valve Witnesses: f a 7 closing automatically bythe rush of steam I W. E. NOF KO,

upon breakage of the glass I 1 i H. HQDoUGLAs. 

